The NEOS Server offers KNITRO
for the solution of general nonconvex, nonlinearly constrained optimization
problems in GAMS format. KNITRO can also
be effectively used to solve simpler classes of problems such as
unconstrained problems, bound constrained problems, linear programs
(LPs) and quadratic programs (QPs).
For a more complete description of KNITRO, see
R. H. Byrd, J. Nocedal, and R. A. Waltz,
KNITRO: An Integrated Package for Nonlinear Optimization,
In G. di Pillo and M. Roma, editors, Large-Scale Nonlinear Optimization, 35-59, 2006.
Springer Verlag.
KNITRO was developed by
Richard Byrd,
Mary Beth Hribar,
Jorge Nocedal and
Richard Waltz with
additional help from Guanghui Liu, Marcelo Marazzi, Todd Plantenga and
Jose Luis Morales.
KNITRO is sold through Ziena Optimization.
Additional information on KNITRO (including information on how to obtain
KNITRO) can be found at the
KNITRO website.
Using the NEOS Server for KNITRO
The user must submit a model in GAMS
format to solve an optimization problem. For security purposes, the model
submitted must adhere to the following conventions:
- The model must be self contained, i.e. no $include or $batinclude
- No execution of external programs is allowed, i.e. no $call or execute
- No file creation, i.e. no put files or $echo
If you are unfamiliar with GAMS, the
GAMS Tutorial
gives a quick introduction to the essentials of a GAMS model and the
output provided when the model is solved. Examples of models in GAMS
format can be found in the
GAMS model library and an
alphabetical index
is also available.
An option file can be used to specify KNITRO options. Currently, the NEOS
Server can only use optfile=1 with GAMS input. Therefore, any model
that specifies a different options file will not work as intended.
The NEOS Server initially limits the amount of output generated in the
listing file by turning off the symbol and unique element list, symbol
cross references, and restricting the rows and columns listed to zero.
This behavior can be changed by specifying the appropriate options
in the model file. See the
documentation on the
modeling language for further information.
You can submit an optimizatino problem specified in the GAMS
modeling language to be solved using the optimization tools on
the NEOS Server. You need to specify the absolute path to a
GAMS file on your system.
Model File:
The Options file is optional and requires that the
statement <modelname>.optfile = 1 ;
exist before the solve statement in your model file. At this
time, only optfile = 1 is supported; however,
options may also be specified within the model input file (see
the GAMS documentation).
Options File:
Optional GDX file for inputs. This file will be renamed to in.gdx. The model must include "$GDXIN in.gdx" to load this file
GDX File:
The solver will return a compressed GDX file which contains all symbols in the model.
Return GDX output:
The log file contains information generated by the algorithm
during a solve. Checking the box will cause the log file to be
included in the output returned.
Return log file:
Enter any additional comments here (e.g. to identify the data
for your own information). These comments will be returned
with your results.
Comments:
Put in priority queue. 5 minute job runtime limit.
Dry run: generate job XML instead of submitting it to NEOS
Please do not click the 'Submit to NEOS' button more than once.
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